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    <title>Document</title>
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       .w video{  
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           top: 0;
          
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        .v{
            
            width: 450px;
            height: 280px;
            margin-left: 34%;
            margin-top: 100px;
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        .v h1{
            
            display: block;
            width: 450px;
            height: 50px;
            margin-top: -4px;
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        .v p{
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            width: 100px;
            height: 30px;
            display: block;
            margin-top: -4px;
            margin-left: 146px;
            font-weight: 700;
            
        }
        .btn1 {
            position: absolute;
            margin-top:328px;
            margin-left: 9%;
           
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    <div class="w">
        <video src="video\4K抽象科幻隧道VJ运动背景霓虹灯隧道免费2160 x 3840.webm"autoplay muted loop></video> 
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    <div class="v">
        <h1>Wellcom to the class 11</h1>
        <p>欢迎来到11班</p>
        <a href="主页.html" class="btn1">立刻探索</a>
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